Shoe bottom roughing machine



Dec. 6, 1966 5. SCHULTZ SHOE BOTTOM ROUGHING MACHINE 2 Sheets-Sheet 1 Filed Oct. 28, 1964 IN VENTOR GEORGE SCHULTZ [FIGI ATTORNEY.

Dec. 6, 1966 a. SCHULTZ 3,239,441

SHOE BOTTOM ROUGHING MACHINE Filed Oct. 28, 1964 2 Sheets-Sheet 2 L: '6 I I. '60

1 |6l mg I 220 r I60 II: I G 3 TORS.

GEORGE SCHULTZ (1/ MRNEY.

United States Patent Office 3,.Zh9A4l Patented Dec. d, 1966 3,289,441 SHOE EUTTUM RUUGHHNG MACHHNE George Schultz, 54 Brush Hill Road, Newton Highlands, Mass. Filed Oct. 28, 1964, Ser. No. 4617,147 4 Claims. (Cl. 69-65) This invention relates to a rotatable tool for cutting, butfing, grinding, sanding or the like. In particular, it relates to a rotatable tool for roughing the overlasted large portion of an upper lying on a shoe bottom. Roughing of this folded over marginal portion of the upper leather is necessary to smooth the wrinkles and provide a suitable surface for cementing the outer sole.

Prior to the present invention, roughing of the margin of the bottom of a shoe prior to cementing consisted generally of the operator holding the shoe in his hand and facing the margin to be roughened against a rotating wire brush. Such a method requires great skill in order to control the width of the margin to be roughened and in order to avoid scoring or scarring any portion of the upper leather of the shoe above the lasted margin. Although some devices have been proposed for roughing which require less skill on the part of the operator, such devices have generally either been rather costly or have deprived the operator of some flexibility or control of his operation.

()ne object of this invention is to provide a machine which will permit the operator to roughen the margin of the bottom of a shoe with suitable precision but without the necessity of great skill.

Other objects and advantages of this invention will be apparent from the specification and claims which follow, taken together with the appended drawings wherein:

FIG. 1 is a front perspective view of one embodiment of this invention.

FIG. 2 is a front view with partial cutaway.

FIG. 3 is a side open view.

The invention comprises in its general sense a powerdriven tool (e.g. reciprocable or rotatable) supported by one end of a member pivotable on a shaft and having its other end balanced in force, so that slight pressure against the tool will cause yielding motion and release of the pressure quick restoration of position. In one preferred form the tool is on the upper end of a vertical member pivotable on a horizontal shaft with counterbalancing on the lower end.

Referring now to the embodiment illustrated in the drawings, the enclosed housing 11 contains two bracket members 25 and 26 supporting a rod 27. The operating device is mounted so as to be pivotable on rod 27 and comprises an elongated vertical member 13 in whose upper end is mounted a rotatable shaft 14 driven via pulley 140, which has a belt 15 connecting to pulley 161i driven by motor 161 mounted on the lower end of elongated frame member 13. Frame member 13 as illustrated has a left side wall 131, a right side wall 132, a top closure 130, cross members 133, 134 and 135, and terminates in a base portion comprising blocks 22 and 23 to which the motor 161is attached.

A vertical adjusting rod 17 extends through cross members 133, 134 and 135 to a universal joint 171 where it is connected to an extension rod 18 terminating in a vertical gear 19. Gear 19 meshes with a horizontal gear 200 whose shaft 20 is threadable in block 22. Rod 18 extends through bracket 21 which in turn is attached by bolt 20 to bottom block 23. A rod 17 has an accessible handle 170 and extends through openings 11a in the front of the housing.

Shaft 14- extends horizontally through slot 111) into chambers 121i and 121. The shaft terminates in a wire brush 141 locked with a nut 141a. A transparent shield 123 is spaced above the .wire brush and an exhausted opening 121a is provided in the lower rear portion of chamber 121 leading to an exhausted pipe 122. normally provided with suction.

In use the operator holds the margin of the bottom of the shoe against the rotating wire brush 141. The pressure causes slight backward yielding motion of the rotating wire brush which is immediately reversed upon release of the pressure. The sensitivity of the balance provides the operator with great sensitivity, control of depth of cut and ease of control in his roughing operation. It is obvious that this sensitivity would be of value in other delicate operations involving cutting, butfing, grinding, sanding and the like.

Rod 1'7 operated by handle permits careful and delicate counterbalancing of the pivotable assembly. Although a mechanical system for counterbalancing is shown, other means may be used, as for example, an air cylinder or a spring.

While a preferred embodiment of my invention has been described in detail, it will be understood that I do not wish to be limited to the particular construction set forth, since various changes in the form, proportions and arrangement of parts, and in the details of construction may be resorted to without departing from the spirit and scope of the invention, or destroying any of the advantages contained in the same, heretofore described and defined in the following claims.

I claim:

1. The combination of a horizontal support member and a vertical assembly pivotable on said support; the upper end of said assembly containing a tool mounted on a rotatable shaft; the lower end of said assembly containing driving means for said shaft; said assembly being substantially counterbalanced, said combination being so characterized that pressure of a workpiece against the driven tool tends to move the tool away from the work piece while release of pressure permits return of said tool to its initial position.

2. A machine for operating on a workpiece comprising a housing, a horizontal rod supported by said housing, an elongated vertical assembly pivotable on said rod and extending both above and below said rod, a rotatable shaft supported by the upper portion of said assembly, a tool attached to said shaft, a counterweight supported by the lower portion of said assembly and driving means for said shaft; said machine being characterized in that pressure of the workpiece against the tool causes said assembly to pivot upon said rod so as to carry said tool away from said workpiece while removal of said pressure permits said assembly to return to its initial position.

3. Claim 2 wherein the workpiece is a shoe and the tool is a roughing wheel.

4. Claim 2 wherein the counterweight is adjustable.

References Cited by the Examiner UNITED STATES PATENTS 161,951 4/1875 Gunn et al 51-99 253,169 1/1882 Patten et al 51-99 2,104,837 1/1938 Hunt 696.5 2,840,835 7/1958 Prue 69-6.5 X 2,990,655 7/1961 Guinn 69-6.5

PATRICK D. LAWSON, Primary Examiner. JORDAN FRANKLIN, Examiner. A. R. GUEST, Assistant Examiner. 

1. THE COMBINATION OF A HORIZONTAL SUPPORT MEMBER AND A VERTICAL ASSEMBLY PIVOTABLE ON SAID SUPPORT; THE UPPER END OF SAID ASSEMBLY CONTAINING A TOOL MOUNTED ON A ROTATABLE SHAFT; THE LOWER END OF SAID ASSEMBLY CONTAINING DRIVING MEANS FOR SAID SHAFT; SAID ASSEMBLY BEING SUBSTANTIALLY COUNTERBALANCED, SAID COMBINATION BEING SO CHARACTERIZED THAT PRESSURE OF A WORKPIECE AGAINST THE 